Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c685572dacddfafe1c5496374af62100302b9c9562e1dfb41e9ed3b33ab468' 
  AND token = 'G4jtBM9ZADxdnA4NSs8joxKLEnWi92sO0VTPs1d1lAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}